Hostname: page-component-586b7cd67f-tf8b9 Total loading time: 0 Render date: 2024-11-24T09:57:58.486Z Has data issue: false hasContentIssue false
  • English
  • Français

Controlled Release Starch Granule Formulations Reduce Herbicide Leaching in Soil Columns

Published online by Cambridge University Press:  12 June 2017

Rick A. Boydston
Rick A. Boydston*
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Irrigated Agric. Res. and Ext. Cent., Prosser, WA 99350
Get access Rights & Permissions [Opens in a new window]

Abstract

Experimental controlled release starch granules (CRSG) containing 5.3% a.i. (w/w) norflurazon or 6% a.i. (w/w) simazine retarded the leaching of both herbicides in loamy sand soil columns when compared to commercial formulations of norflurazon [80% (w/w) dry flowable] or simazine [90% (w/w) water dispersible granule]. Barley bioassays indicated norflurazon and simazine remained in the surface 0 to 2.5 cm of soil when applied as CRSG formulations and moved to a depth of 15 cm when applied as commercial dry formulations and leached with 6 cm of water. CRSG placed on pre-wetted soil columns began to release norflurazon by 7 d at 25 C or 14 d at 15 C, and subsequent leaching moved norflurazon beyond the top 2.5 cm of the soil column.

Keywords

Norflurazon, 4-chloro-5-(methylamino)-2-(3-trifluoromethyl)phenyl)-3(2H)-pyridazinonesimazine, (6-chloro-N,N-diethyl-1,3,5-triazine-2,4-diamine)barley, Hordeum vulgare L.Encapsulationslow releaseherbicidesgroundwater quality
Type
Research
Information
Weed Technology , Volume 6 , Issue 2 , June 1992 , pp. 317 - 321
Copyright
Copyright © 1990 by the Weed Science Society of America 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Literature Cited

1. Coffman, C. B., and Gentner, W. A. 1980. Persistence of several controlled release formulations of trifluralin in greenhouse and field. Weed Sci. 28:21–23.Google Scholar
2. Collins, R. L., Doglia, S., Mazak, R. A., and Samulski, E. T. 1973. Controlled release of herbicides—theory. Weed Sci. 21:1–5.Google Scholar
3. Schreiber, M. M., Srasha, B. S., Trimmell, D., and White, M. D. 1988. Controlled release herbicides in Methods of Applying Herbicides, C. McWhorter, G. and Gebhardt, M. R. (Eds.). WSSA Monograph 4, p. 177–191.Google Scholar
4. Trimnell, D., and Shasha, B. S. 1990. Controlled release formulations of atrazine in starch for potential reduction of groundwater pollution. J. Contr. Release 12:251–256.CrossRefGoogle Scholar
5. Wauchope, R. D., Glaze, N. C., and Dowler, C. C. 1990. Mobility and efficacy of controlled release formulations of atrazine. Weed Sci. Soc. Am. Abstr. 30:216.Google Scholar
6. White, M. D., and Schreiber, M. M. 1984. Herbicidal activity of starch encapsulated trifluralin. Weed Sci. 32:387–394.Google Scholar
7. Wing, R. E., Doane, W. M., and Schreiber, M. M. 1990. Starchencapsulated herbicides approach to reduce groundwater contamination. ASTM Pub. No. 1078 in Pesticide formulations and application systems: Tenth symposium, Ed., Bode, L. E., Hazen, J. L., and Chasin, D. G. (Ed.) ASTM, Philadelphia, PA.Google Scholar
8. Wing, R. E., Maiti, S., and Doane, W. M. 1987. Effectiveness of jet-cooked pearl cornstarch as a controlled release matrix. Starch/Starke 39:422–425.Google Scholar
9. Wing, R. E., Maiti, S., and Doane, W. M. 1988. Amylose content of starch controls the release of encapsulated bioactive agents. J. Contr. Release 7:33–37.Google Scholar
10. Yaron, B. E., Bresler, E., and Shalhevet, J. 1966. A method for uniform packing of soil columns. Soil Sci. 101:205–209.Google Scholar